tvos-arm64 Mono AOT precompilation fails with Invalid IL code for multiple test assemblies

[kotlarmilos]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1362636
Build error leg or test failing: System.Net.NameResolution.Functional.Tests.WorkItemExecution, System.Reflection.Context.Tests.WorkItemExecution, System.Text.Encoding.Extensions.Tests.WorkItemExecution
Pull request: #125441

Affected CI jobs: build_tvos_arm64_Release_AllSubsets_Mono

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "Precompiling failed",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Summary

On tvos-arm64 Mono Release (AOT mode), the Mono AOT compiler fails to precompile test assemblies with "Invalid IL code" errors:

Precompiling failed for aot-instances.dll with exit code 134
Unable to compile method ... due to: 'Invalid IL code in ...: IL_0000: ret'

3 work items affected:

• System.Net.NameResolution.Functional.Tests
• System.Reflection.Context.Tests
• System.Text.Encoding.Extensions.Tests

Note

This issue was filed with the assistance of GitHub Copilot.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1362636
Error message validated: [Precompiling failed]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/2/2026 10:17:08 AM UTC

Report

Build	Definition	Test	Pull Request
1429323	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1428393	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128409
1428400	dotnet/runtime	System.Data.Common.Tests.WorkItemExecution
1427748	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#124173
1427615	dotnet/runtime	System.ComponentModel.Annotations.Tests.WorkItemExecution
1427236	dotnet/runtime	System.Diagnostics.FileVersionInfo.Tests.WorkItemExecution
1426173	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128284
1424920	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128068
1425182	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#128116
1424079	dotnet/runtime	System.Net.Http.Json.Functional.Tests.HttpClientJsonExtensionsTests.GetFromJsonAsync_EnforcesMaxResponseContentBufferSize
1423593	dotnet/runtime	System.Composition.AttributeModel.Tests.WorkItemExecution
1423053	dotnet/runtime	Microsoft.Extensions.Hosting.Systemd.Tests.WorkItemExecution
1422445	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#128116
1420484	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128068
1420660	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#128116
1420407	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128135
1420047	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1418805	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#124173
1419138	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#128116
1418286	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1418360	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#128116
1417611	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128049
1417637	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128068
1416787	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1416322	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#128049
1415929	dotnet/runtime	System.Configuration.ConfigurationManager.Tests.WorkItemExecution	#125437
1414719	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1414320	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1413202	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1412341	dotnet/runtime	System.Configuration.ConfigurationManager.Tests.WorkItemExecution	#125437
1411505	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1410315	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#127787
1408366	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1408038	dotnet/runtime	System.Runtime.Tests.WorkItemExecution
1407709	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#127498
1407922	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127228
1407162	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127730
1407122	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127722
1407104	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127719
1407087	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127716
1407077	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127714
1407019	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution
1406953	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127005
1406950	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127695
1406826	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1406848	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127690
1406235	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#127613
1406729	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#126549
1406427	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1405999	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1405957	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#126569
1405703	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#127613
1404759	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1404899	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#125023
1404675	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127626
1404470	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#127613
1404542	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#126367
1403445	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#127498
1404061	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127614
1403858	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127454
1403665	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127328
1402431	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127567
1403265	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution
1402968	dotnet/runtime	System.IO.Hashing.Tests.WorkItemExecution
1403076	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1403089	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#126782
1402127	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127256
1402544	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution	#127578
1402552	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#126367
1402422	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127452
1401886	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127464
1401875	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#125437
1401598	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127553
1401627	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127554
1400912	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#125955
1400922	dotnet/runtime	System.IO.Hashing.Tests.WorkItemExecution
1400109	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#125061
1400045	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#125023
1399596	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#127497
1399541	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127464
1398689	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#127465
1398771	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127475
1398685	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#126569
1398650	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127106
1398561	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#118616
1398475	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127328
1398351	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127462
1397946	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127451
1397645	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127225
1397430	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127443
1397400	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#126569
1397369	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127258
1397217	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#126549
1396376	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#126035
1396313	dotnet/runtime	System.Runtime.Loader.DefaultContext.Tests.WorkItemExecution
1395529	dotnet/runtime	iOS.Device.ExportManagedSymbols.Test.WorkItemExecution	#125955
1395131	dotnet/runtime	System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution	#127387
1395010	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127238
1394507	dotnet/runtime	iOS.Device.Aot.Test.WorkItemExecution	#127112
1394426	dotnet/runtime	System.Runtime.Tests.WorkItemExecution	#127135
Displaying 100 of 112 results

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
3	15	112

[dotnet-policy-service]

Tagging subscribers to 'os-tvos': @vitek-karas, @kotlarmilos, @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

[BrzVlad]

@kotlarmilos Any idea about this ? I seem to remember you fixed something similar at some point, with the issue being that we were passing the wrong processed assemblies to the compiler, some issue on the infrastructure side.

Looking at some logs seems like this might match on unrelated issues. Ex:

/tmp/helix/working/9699087B/p/build/apple/AppleBuild.targets(260,5): error : Precompiling failed for /tmp/helix/working/9699087B/w/B61009D4/e/publish/JsonSchema.Net.dll with exit code 1. [/private/tmp/helix/working/9699087B/w/B61009D4/e/publish/ProxyProjecUnhandled exception: Unhandled exception: No space left on device